Electric cut-out.



T. E. MURRAY.

ELECTRIC CUT-OUT.

AIPLIOATIOH rum) JURBQ, 191s.

Patented July 21, 1914.

75 81 WW wto'e M Q M $51 atto'mw QWL THOMAS E. MURRAY, OF NEW YORK, N.Y.

ELECTRIC CUT-OUT.

Specification of Letters Patent.

Patented July 21, 1914.

Application filed June 9. 1913. Serial No. 772,529.

To all will om. it may concern 3e it known that: l, THOMAS E. hlCRRAY, acitizen of the United States, residing at hiew York, in the county ofNew York and State of New York, have invented a certain new and usefullmprm'ement in l lectric Cut-Outs, of which the following is a specification.

The invention is gin electric cut-out desigi'ied for use in a three-wiresystem. co1nprising two switch levers,each movable and fuse plugs onsaid levers cooperating with contacts on said bloc-it: the constructionbeiu -li that one of said plugs establishes -('iIt.-.i1t'.in positivelead and neutral lead, and

the other plug establishes circuit in negative lead and neutral lead. llhen both levers are closed, circuit is established, and when both leversare open, circuit is broken in the system. y

In the accon'ipanying drawings--Figure l is a side cle 'ation of mycut-out box. Fig. 2 a plan view, showing one of the shields in sectionon the line a, of Fig. 1. Fig. is a section on the line 3 y of Fig. Fig.1 is a section on the line 2', 2 of Fig. 3.

Similar numbers and letters of reference indicate like parts.

The connections as here represented adapt the device ioruse on athree-wire circuit.

The basf' block 1, of refractory insulating material, has twolongitudinal channels 3 on its upper side. On the lower side of saidblock. and disposed transversely to channels 2, 3 are three bus-bars l,5, 6, separated by layers of insulation. Seated also on the lower sideof block 1 are three bar conductors 7, S, 9, connected as follows;

Conductor 7 crosses and is in contact with bus-bar 4i, and is connectedthrougl'i an opening in the base block to one member 10 of a pair ofcontacts in channel 2, the

other member of said pair being plate 11,

to which circuit wire 12 is secured. Conductor S crosses and is incontact with busbar (3, and has a connection 13, dotted lines Fig. 4c,which extends up through an opening in the block at the other end ofchannel 2, where it forms one member of a pair of contacts, the othermember of said pair being a plate (not shown) similar to plate 11, towhich circuit wire lei is attached. Conductor 9 crosses and is incontact with bus-bar 5, and at its ends has connections'extending upthrough openings in the block at opposite ends of channel 3, to members15, 16

ot'pairs of contacts. the opposite members of said pairs being plates 17similar to plate ll. (hie oi said plates 17 is shown in Figs. 2 and i.To said plates 17 are connected the terminals 20. its thus arranged,'wire 12 may be the positive lead of a three wire system, wire 1- thenegative lead, and-wire :20 the neutral lead.

Tl'wo fuse plug carrying switc A. B are pro 'idcd each in the term of adell-crank lever pivoted to the base. he switch It opens and closescircuit between Tilt. con tacts 10, ii in channel and between thecontacts 16, l? in channel li'he switch ll opens and closes circuitbetween the other two pairs of contacts in said channels. Said switchesare alike in construction, so that the description of one applies toboth.

are parallel arms projecting from a cross-piece lnsaid armsare openingsto receive the fixed rod L l. secured to the block by straps 25, uponwhich rod said arms freely turn. Secured to the or [piece is a hollowsemi-cylindrical metal shield 26.

- ()n the upper side of said shield is an operating handle '27. andwithin said shield is a depending partition 28 of insulating material.

The t'usc plugs have openings to receive the ends of arms 22. Eachcarrier cinnpriscs a block of insulating material having an upwardlyextending thin paitition, over which doubled the fuse strip l). Thestrip lies in contact with opposite sides of the plug and is securedthereon. When a plug, is in place between the members of a pair ofcontacts, circuit is closed through the fuse strip.

\Vhen switch A is closed (B being open) circuit is established by theinsertion of the fuse plugs in the neutral and negative conductors.\l'hen switch B is closed (A being open) circuit is established by theinsertion of the fuse plugs in the neutral and positive conductors. Thelevers are operated by the handles :27.

I do not claim herein the subject-matter of Serial No. 764,491, filedApril 30, 1913, by Arthur V. A. Mcilarg.

i claim:

1. A base, having a plurality of channels. a plurality of mutuallyinsulated bus-bars extending transversely across said base, connectionsextending: from said bars through said'basc and into said channels andeach connection connnunicatiug with one metal ill) I said pairs, circuitleads connected to said plates, and means for closing circuit betweenthe members of each pair.

2. A base, a group of two pairs of contacts on said base, the pairs ofsaid group being interposed respectively, in the positive ,and neutralconductors of a three-Wire system, a second group of two pairs ofcontacts on said base, the pairs of said second group being interposedrespectively in the negative and neutral conductors of said system, abellcrank switch lever pivoted to said base, fuse plugs on said leverand adapted to enter between the members of the pairs of one of saidgroups, a second bell-crank switch lever pivoted to said base, and fuseplugs carried as said lever and adapted to enter between the members ofthe pairs of the other of said groups.

3. A base, three mutually insulated busbars extending across said base,two pairs of contacts on said base, each pair having one memberconnected to one of said busbars, circuit terminals connected to theopposite members of said pairs, a pair of contacts on said base, eachhaving one member connected to one of the other bus-bars, circuitterminals connected to the opposite members of said pairs, the said fourpairsof contacts being arranged in two groups of two pairs each, eachgroup including one of nioaseo the two pairs of contacts connected tothe same bus-bar, two bell-crank switch levers pivoted to said base, andfuse plugs on said lever; the fuse plugs on. one of said leversoooperating with one of said groups of contacts, and the fuse plugs onthe other of said levers cooperating with the other of said groups ofcontacts.

4. A base, a pair of contacts thereon, a fuse plug entering and closingcircuit between said contacts, and a bell-crank lever pivoted to saidbase; one arm of said lever carrying said fuse plug, and the other armbeing a hollow shield covering said plug.

5. A base, a pair of contacts thereon, a fuse plug entering and closingcircuit between said contacts, a shaft journaled on said base, an arm onsaid shaft supporting said fuse plug, and a hollow shield. on said shaftextending over said plug.

6. A base, a pair of contacts thereon, a fuse plug entering and closingcircuit tween said contacts, ashaft journaled on. said base, an arm onsaid shaft supporting said fuse plug, a hollow selni-cylindricul shieldon said shaft extending over said plug, and a handle on said shield.

In testimony whereof I have allixed my signature in presence of twoWitnesses.

THOMAS E. MURRAY. lVitnesses GERTRUDE T. Pon'rin, MAY T. McGAnnr.

